年轻疏散星团候选者Alessi 5和β Monocerotis的恒星和亚恒星质量函数
Stellar and substellar mass function of the young open cluster candidates Alessi 5 and beta Monocerotis
摘要：
虽然在各种年轻和年老的疏散星团中已经研究了恒星和亚恒星的种群，但在年龄范围从5到1亿年的星团中进行额外的研究是至关重要的（例如，用改进的统计数据对初始质量函数的变化进行更多的限制）。在最近研究的疏散星团候选者中，考虑到它们的年轻和相对接近性，有两个星团最适合对极低质量恒星和棕矮星进行光度测量：Alessi 5（t ~ 4000万年，d ~ 400 pc）和麒麟座β（t ~ 910万年，d ~ 400 pc）。对于这两个集群，我们进行了光学和近红外测光调查，和虚拟天文台调查。我们的观测范围从大质量B型主序星到30 M_Jup的褐矮星都很敏感。在这里，我们提出并讨论初步的结果，包括阿莱西5，这是令人惊讶的非常相似的毕星团（t ~ 600百万年）的质量函数，虽然他们是非常不同的年龄获得的质量函数。
英文摘要：
Although the stellar and substellar populations have been studied in various young and old open clusters, additional studies in clusters in the age range from 5 to 100 Myr is crucial (e.g. to give more constrains on initial mass function variation with improved statistics). Among the open cluster candidates from recent studies, two clusters are best suited for photometric survey of very-low mass stars and brown dwarfs, considering their youth and relative proximity: Alessi 5 (t ~ 40 Myr, d ~ 400 pc) and beta Monocerotis (t ~ 9.1 Myr, d ~ 400 pc). For both clusters, we performed an optical and near-infrared photometric survey, and a virtual observatory survey. Our survey is predicted to be sensitive from the massive B main sequence stars down to brown dwarfs of 30 M_Jup. Here, we present and discuss preliminary results, including the mass function obtained for Alessi 5, which is surprisingly very similar to the mass function of the Hyades (t ~ 600 Myr), although they are of very different ages.
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